GEOGRAPHIC INFORMATION (Tables)

6 Months Ended

Nov. 30, 2021

Geographic Information Disclosure [Abstract]

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended November 30,				Six Months Ended November 30,
	2021		2020		2021		2020
Revenues from sales to unaffiliated customers:
Asia	$	3,373,000	$	550,000	$	4,048,000	$	897,000
Europe		796,000		580,000		1,267,000		1,171,000
North America		429,000		107,000		534,000		241,000
Middle East		46,000		96,000		54,000		125,000
South America		3,000		40,000		6,000		82,000
	$	4,647,000	$	1,373,000	$	5,909,000	$	2,516,000